Green stools in a week-old child may be caused by dietary factors, indigestion, taking medication and other reasons. 1. Dietary factors: Recently the baby ate too much green food, such as spinach, broccoli and so on, may lead to the baby’s stool green. 2. Indigestion: baby’s abdomen is cold, usually irregular diet, overeating, etc. can lead to indigestion, affecting the normal peristalsis of the gastrointestinal tract, food can not be digested and absorbed in a timely manner, which can lead to the baby’s green stools. 3. Taking medication: If the baby himself suffers from iron deficiency anemia, he needs to take iron treatment. The body is not able to fully absorb the iron, iron with the stool discharge, can lead to stool green. It is recommended that week-old children with green stools go to the hospital in a timely manner, and follow the doctor’s instructions for treatment to avoid delays.